Magento: Unable to override Sales Rule

问题

I am unable to override Sales Rule Model. I want to override class Mage_SalesRule_Model_Rule.

Here is my code:-

<?xml version="1.0"?>
<config>
    <modules>
        <MyNamespace_MyModule>
            <version>0.1.0</version>
        </MyNamespace_MyModule>
    </modules>
    <global>
        <models>
            <salesrule>
                <rewrite>
                    <rule>MyNamespace_MyModule_Model_Rule</rule>
                </rewrite>
            </salesrule>
        </models>
    </global>
</config>

But this doesn’t work.

Any help please?

回答1:

Thank you all for helping in debugging my problem.

The problem is solved now.

I had written the override code in another local module XML file as well. However, I had commented that code and my cache is disabled. But, I don't know how it was causing problem. So, when I removed that commented code (from another module) then my problem was solved and I was able to override salesrule model.

I would like to write some tips for others if they face such problem. These tips are based on the comments in this question.

Recheck if your XML snippet is in the right location.
Check if the module is being instantiated (System -> Configuration -> Advanced).
Check for other modules that may also be overriding the same model. Especially those in 'local' since they take precedence.
Check what class is returned when you call your desired class:

echo get_class(Mage::getModel('salesrule/rule'));

Thank you all for your comments.

来源：https://stackoverflow.com/questions/7688803/magento-unable-to-override-sales-rule

标签

php

magento

overriding

rewrite